---
type: threshold
id: catechol-pyrocatechol
asset: workplace-exposure-limits
title: "Catechol; pyrocatechol — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "120809 | S | Catechol; pyrocatechol | 5 | 20"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Catechol; pyrocatechol"
pel_ppm: "5"
pel_mgm3: "20"
verified: true
---
**Substance:** Catechol; pyrocatechol

**PEL (ppm):** 5

**PEL (mg/m³):** 20

> 120809 | S | Catechol; pyrocatechol | 5 | 20

Source: <https://www.dir.ca.gov/title8/5155.html>